winter dormancy

_Autumn Leaves
The autumn leaves are changing color and falling...
Incredibly beautifull.

but why?
" The largest factor in why leaves change color in the autumn is photoperiodism-the length of day and night. As the nights get longer in Autumn, the process of senescence becomes apparent through color change and the falling of leaves, leading the tree into it's winter dormancy. "

hum... "winter dormancy"... i like that!, i feel the same.